Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents		$ 639,722	$ 566,204
Short-term investments		1,022,391	931,718
Accounts receivable, net		422,559	574,810
Current portion of deferred commissions		144,629	139,890
Prepaid expenses and other current assets		145,185	132,071
Total current assets		2,374,486	2,344,693
Deferred commissions, less current portion		283,124	282,490
Long-term investments		674,633	581,856
Property and equipment, net	[1]	350,651	347,216
Operating lease right-of-use assets	[1]	393,561
Intangible assets, net		93,252	100,582
Goodwill		151,184	148,845
Other assets		78,004	73,458
Total assets		4,398,895	3,879,140
Current liabilities:
Accounts payable		38,668	30,733
Accrued expenses and other current liabilities	[1]	306,161	330,246
Current portion of deferred revenue		1,711,060	1,651,594
Current portion of operating lease liabilities	[1]	41,952
Total current liabilities		2,097,841	2,012,573
Deferred revenue, less current portion		36,722	38,597
Operating lease liabilities, less current portion	[1]	380,944
Convertible senior notes, net		669,875	661,707
Other long-term liabilities	[1]	18,562	55,064
Total liabilities		3,203,944	2,767,941
Stockholders’ equity:
Common stock		185	180
Additional paid-in capital		2,164,930	2,093,834
Accumulated other comprehensive income (loss)		10,323	(4,035)
Accumulated deficit	[1]	(980,487)	(978,780)
Total stockholders’ equity		1,194,951	1,111,199
Total liabilities and stockholders’ equity		$ 4,398,895	$ 3,879,140

[1] We adopted Topic 842 using the modified retrospective method as of January 1, 2019 and elected the transition option that allows us not to restate the comparative periods in our condensed consolidated financial statements in the year of adoption. See Note 2 for further details.